Technical
Details

CORDENKA® Rayon is highly resistant to chemicals and heat.

As high temperatures can occur during operation, thermal stability is of crucial safety importance for high-performance tyres. Below you will find an illustration of the temperature behaviour of rayon cord in tyre reinforcement compared to HMLS polyester.

Thermal stability

Dynamic modulus of elasticity

The diagram below shows the dynamic modulus of elasticity of the fibre cords for a temperature range of 20 to 200°C. Below a temperature of 80°C, the modulus of both materials is relatively stable. Above 80°C, however, the modulus of polyester drops sharply – in contrast to that of CORDENKA® Rayon.

Workloss and heat generation

Below you can see the workloss of rayon and polyester in a temperature range from 20 to 200°C. The value for polyester is generally higher and increases in the relevant temperature range from 110 to 170°C. For rayon, the workloss remains at a low and constant level. As workloss is also associated with the generation of heat, a reliably low value also supports the safety of the tyre.

Mechanical performance

CORDENKA® Rayon is characterised by a higher modulus and higher dimensional stability compared to other common reinforcement materials, accompanied by a correspondingly low hysteresis.

Elongation under load

The two figures below show the elongation behaviour of impregnated rayon cord in comparison with HMLS polyester for two different temperatures. It is easy to see that CORDENKA® Rayon clearly outperforms the polyester material here. Even under a load of 20% of the breaking load, the elongation of the cord remains below 2%, both at 20°C and at 80°C. In contrast, polyester already shows an elongation of over 6% at 80°C under the same load.

Tyre cord and fabric are based on CORDENKA® Rayon continuous multifilament yarn. The yarn is available with different linear densities and a different number of filaments. We also offer raw cord and fabric without impregnation.

CORDENKA® 610F SUPER 2

Yarn specification

The tests were carried out with a conditioned yarn with a twist of Z100 t/m.

Linear Density (nominal) [dtex]	Number of Filaments (nominal)	Linear Density [dtex]	Breaking Force [N]	Breaking Tenacity [mN/tex]	Elongation at Break [%]	EASF (45N) [%]
1220	720	1257	56.8	452	10.7	7.7
1840	1000	1875	69.6	478	12.6	4.5
2440	1350	2485	116.4	468	12.7	3.2

Twist and make-up

Cylinder bobbins, dimensions pallet 126/105/110 cm

Linear Density (nominal) [dtex]	Number of Filaments (nominal)	Twist [t/m]	Package Weight [kg]	Tube Dimension L/⌀ [mm]	Spool ⌀ [mm]	Spools per Pallet	Pallet Weight [kg]
1220	720	Z 100	4.3	170/32	240	205	645
1220	720	0	10.0	290/94	205	240	540
1840	1000	Z 100	4.3	170/37	240	205	645
1840	1000	0	4.3	175/56	205	205	538
1840	1000	0	10.0	290/94	205	240	540
2440	1350	Z 100	4.3	170/37	240	205	645
2440	1350	0	10.0	290/94	205	240	504

CORDENKA® 700 SUPER 3